You can add screenshots to it if you want, once it is published and you go to the dupe's workshop page to do that, but its not necessary to add screenshots. If you want to publish it: Then when the dupe shows up on the list, you hover over it, and click publish, and go from there.
If you are happy with it, hold the q key and click to the Dupe tab.
Once you have coppied the dupe, I'd test that it turned out right, by using the dupe tool to spawn it. Then you take the duplicator tool and you look at the instructions for using the dupe tool that show in the top left of the screen while that item is out. Then you do whatever you want to it, recolor it, weld something to it, etc. First you spawn something in garry's mod.
